Now what do I do?

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So I thought I’d do the responsible thing and check the differential fluid. I guess I didn’t have the drive all the way in the hole and the plug broke.
But I didn’t expect it to be so fragile. I thought it would be iron, not some sort of cast.
So now what? I could probably mangle it more and get it out, maybe. But where can a get a new plug?
Suggestions of removing and replacing is appreciated.
Until then I guess my diff is like Schrödinger’s Cat. It is both full and empty.
Author: HappyJack